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Use this to convert your Marine Block to Hook and Loop to suit velcro sandpapers. The Marine Block is a favourite amongst professionals and those who want perfection. It's the longest in the 70mm wide range. It accurately blocks flat panels and those panels with a slight amount of curve. Ideal for large flat body sides, bonnets, roofs and rear quarter panels. Accomplish that perfect surface without digging in. This block will create that perfect flat finish.